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  • PLASMA PHYSICS  (7)
  • Nuclear Reactions  (3)
  • LUNAR AND PLANETARY EXPLORATION  (2)
  • 1
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    Evidence of quasifission in the ^{16} O +  ^{238} U reaction at sub-barrier energies (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-02-10
    Description: Author(s): K. Banerjee, T. K. Ghosh, S. Bhattacharya, C. Bhattacharya, S. Kundu, T. K. Rana, G. Mukherjee, J. K. Meena, J. Sadhukhan, S. Pal, P. Bhattacharya, K. S. Golda, P. Sugathan, and R. P. Singh Mass distribution of fission fragments and neutron multiplicity in the ^{16} O+^{238} U reaction were measured at near- and below-barrier energies. A sudden change in the fragment mass width, observed in the present measurement, confirmed the transition to quasifission at below-barrier energies; the... [Phys. Rev. C 83, 024605] Published Wed Feb 09, 2011
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Fragment emission mechanism in the ^{32} S+ ^{12} C reaction (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-06-06
    Description: Author(s): Ratnesh Pandey, S. Kundu, C. Bhattacharya, K. Banerjee, T. K. Rana, S. Manna, G. Mukherjee, J. K. Meena, A. Chaudhuri, T. Roy, Pratap Roy, Md. A. Asgar, V. Srivastava, A. Dey, M. Sinha, T. K. Ghosh, S. Bhattacharya, S. K. Pandit, K. Mahata, P. Patle, S. Pal, A. Shrivastava, and V. Nanal The complex fragment emission from the decay of fully energy-relaxed composite, Ti * 44 formed via the S 32 + C 12 reaction at two excitation energies, have been studied. Inclusive energy distributions of the fragments ( 3 ≤ Z ≤ 8 ) emitted in the reaction S 32 + C 12 have been measured in the angular range ∼ 16 ∘ – 28 … [Phys. Rev. C 95, 064603] Published Mon Jun 05, 2017
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Fission fragment mass distributions from $^{210}\mathrm{Po}$ and $^{213}\mathrm{At}$ (2017)
    American Physical Society (APS)
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    Publication Date: 2017-12-19
    Description: Author(s): A. Sen, T. K. Ghosh, S. Bhattacharya, K. Banerjee, C. Bhattacharya, S. Kundu, G. Mukherjee, A. Asgar, A. Dey, A. Dhal, Md. Moin Shaikh, J. K. Meena, S. Manna, R. Pandey, T. K. Rana, Pratap Roy, T. Roy, V. Srivastava, and P. Bhattacharya Background : The influence of shell effect on the dynamics of the fusion fission process and its evolution with excitation energy in the preactinide Hg-Pb region in general is a matter of intense research in recent years. In particular, a strong ambiguity remains for the neutron shell closed Po 210 nu... [Phys. Rev. C 96, 064609] Published Mon Dec 18, 2017
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Nonlinear evolution of a large-amplitude circularly polarized Alfven wave: Low beta (1994)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The nature of turbulent cascades arising from the parametric instabilities of a monochromatic field-aligned large-amplitude circularly polarized Alfven wave is investigated via direct numerical simulation for the case of low plasma Beta and no wave dispersion. The magnetohydrodynamic code permits nonlinear couplings in the parallel direction to the ambient magnetic field and one perpendicular direction. Compressibility is included in the form of a polytropic equation of state. Anisotropic turbulent cascades, similar to those found in early incompressible two-dimensional simulations, occur after nonlinear saturation of the parallel propagating decay instability. The turbulent spectrum can be divided into three regimes: the lowest wave numbers are dominated by lower sideband remnants of the parametric process, intermediate wave numbers display nearly incompressible dynamics, and the highest wave numbers are dominated by acoustic turbulence.
    Keywords: PLASMA PHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 99; A7; p. 13,351-13,362
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  • 5
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    Nonlinear evolution of a large-amplitude circularly polarized Alfven wave: High beta (1994)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The nonlinear dynamics following saturation of the parametric instabilities of a monochromatic field-aligned large-amplitude circularly polarized Alfven wave is investigated via direct numerical simulation in the case of high plasma beta and no wave dispersion. The magnetohydrodynamic (MHD) code permits nonlinear couplings in the parallel direction to the ambient magnetic field and one perpendicular direction. Compressibility is included in the form of a polytropic equation of state. Turbulent cascades develop after saturation of two coupled oblique three-wave parametric instabilities; one of which is an oblique filamentationlike instability reported earlier. Remnants of the parametric processes, as well as of the original Alfven pump wave, persist during late nonlinear times. Nearly incompressible MHD features such as spectral anisotropies appear as well.
    Keywords: PLASMA PHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 99; A10; p. 19,289-19,300
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  • 6
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    A reconsideration of the effects of terminator ionopause height on the nightward ion transport at Venus (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The ionopause altitude near the terminator is a crucial parameter for studies dealing with the maintenance of the nightside ionosphere of Venus. It is generally thought that, during high solar wind dynamic pressures (P(SW)) or during solar minimum conditions, the ionopause comes down to very low altitudes so that the dayside ionosphere is not able to supply sufficient plasma to maintain the observed nightside densities. However, there are a number of workable definitions of the ionopause. Near the terminator, the altitude of the ionopause differs considerably depending upon the definition. The ionopause deduced from the radio occultation experiment as well as the pressure ionopause can be significantly lower than the density ionopause deduced from the Langmuir probe at these locations. The latter refers to the altitude where the electron density falls to 100/cu cm. Using in situ data from the Pioneer Venus Orbiter, it is shown that the density ionopause remains fairly high even for high P(SW) conditions. Simple quantitative estimates indicate that significant flow of plasma is still possible under these conditions. Thus, nightward transport of plasma during high P(SW) conditions may be more efficient than has been assumed so far. Since such conditions are more prevalent during solar cycle minimum, it is argued that transport may be relevant in the maintenance of nightside ionosphere at that time also.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; A9, S; 13
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  • 7
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    The onset of Alfvenic turbulence (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: An investigation is conducted on how low-frequency MHD oscillations in a warm plasma may undergo a transition from a coherent state to one of turbulence. A driven/dissipative derivative nonlinear Schroedinger equation is derived from the fluid equations. The time evolution of an arbitrary spectrum of waves is analyzed in the case where one k-mode is unstable, with the rest damped. It is found that the transition from order to chaos in the driven/dissipative system is correlated with the existence or absence of 'breathing' solitons in the associated conservative system.
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids (ISSN 0031-9171); 30; 1371-138
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  • 8
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    Parametric instabilities of a large-amplitude circularly polarized Alfven wave - Linear growth in two-dimensional geometries (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The growth of parametric instabilities, which may lead to the development of a turbulent cascade, is studied using an MHD code that permits nonlinear couplings in the parallel direction to the ambient magnetic field and one perpendicular direction. Compressibility is included in the form of a polytropic equation of state. Parametric instabilities associated with a parallel-propagating decay instability are found to dominate the low-beta case. An obliquely propagating filamentationlike instability dominates the high-beta case. The nonlinear growth of the nth harmonic of a daughter wave growing as a factor of n times the fundamental's growth rate is found in both cases. Nonlinear saturation is caused by the parallel decay instability in the low-beta case and by the oblique filamentationlike instability in the high-beta case.
    Keywords: PLASMA PHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; A9; p. 15,561-15,570.
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  • 9
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    Chaotic behaviour of high Mach number flows (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The stability of the super-Alfvenic flow of a two-fluid plasma model with respect to the Mach number and the angle between the flow direction and the magnetic field is investigated. It is found that, in general, a large scale chaotic region develops around the initial equilibrium of the laminar flow when the Mach number exceeds a certain threshold value. After reaching a maximum the size of this region begins shrinking and goes to zero as the Mach number tends to infinity. As a result high Mach number flows in time independent astrophysical plasmas may lead to the formation of 'quasi-shocks' in the presence of little or no dissipation.
    Keywords: PLASMA PHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 148; 1 Ju
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  • 10
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    Variability of dayside electron temperature at Venus (1994)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Langmuir probe measurements on Pioneer Venus Orbiter show that electron temperature (Te) profiles exhibit two distinct regions. The lower, but more extended region is in the main ionosphere where Te increases slowly with altitude. The other, less extended region is in the ionopause, where Te rise sharply with altitude. If horizontal magnetic fields and flux ropes in the ionosphere inhibit vertical thermal conductivity sufficiently, then the observed Te profile could be explained with EUV as the major heat source (Cravens et al., 1980). The rise in Te in the ionopause region has generally been attributed to solar wind heating (Brace and Kliore, 1991). We suggest that this sharp rise in Te is due primarily to the steep fall in electron density, Ne. If the heating rate is essentially unchanged and heat conduction is not of primary importance, then a steep rise in Te will maintain a constant electron cooling rate for a steeply falling Ne. We have observed large orbit to orbit variations in Te in the ionopause region which are found to be inversely related to changes in Ne. Variations in solar wind dynamic pressure do not seem to have a direct effect on Te, rather the effect is indirect coming through the sharp decrease in Ne.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: PAPER-93GL03384 , Geophysical Research Letters (ISSN 0094-8276); 21; 1; p. 77-80
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